But that's not even the interesting part.
Fun fact, Itsuno's idea for Vergil's split most obviously came from William Blake's "The Book of Urizen". Which was a fantasy novel written in prose as his little "fuck you" to Christianity and his own spin on Greek mythos, it was basically fan fiction. Urizen believes himself holy and above man, he is the essence of cruelty and jealousy. That leads him to proclaim the sins of man and writes it down on brass tablets and gives them to Moses, dooming mankind. When that happens, the human "Los" is created who is a smith that is the embodiment of humanity. Said to have beat his hammer to the beat of his own heart. Los then creates an extension of himself, another man, which he then falls in love with and changes him into the first woman, Enitharmon. But by creating her though, he inadvertently creates the sin of desecrated love and sexual strife. Los has a son named "Orc" which is the spirit of rebellion. The moment Los's wife is created, their love ends and Los finds himself forever enraged by Orc's existence. Los ends up chaining Orc to a mountain as revenge and Enitharmon tries to free her son to no avail.
Who knows how far Itsuno will copy The Book of Urizen, but there is definitely a lot of material to use, there are plenty of demons in this fantasy story too all with cool names too.